> I want to check whether a number register contains a certain number
> and a string register contains one of the predefined strings:
>
> .ds str1 bar
> .nr nr1 5
> .if ((\n[nr1]=5) & ("\*[str1]"foo" : "\*[str1]"bar" : "\*[str1]"baz")) \{\
> . tm okay
> .\}
This doesn't work. groff.info says about 'XXX'YYY' and other
operators:
Note that these operators can't be combined with other operators
like `:' or `&'; only a leading `!' (without whitespace between the
exclamation mark and the operator) can be used to negate the
result.
> .ds str1 bar
> .nr nr1 5
> .nr nr2 0
> .if "\*[str1]"foo" .nr nr2 1
> .if "\*[str1]"bar" .nr nr2 1
> .if "\*[str1]"baz" .nr nr2 1
> .if ((\n[nr1]=5) & (\n[nr2]=1)) \{\
> . tm okay
> .\}
> .rr nr2
>
> That works as expected, but there has to be an obvious and easy
> solution without the additional number register.
Not that I'm aware of. Note, however, if you have a lot of such
comparisons, you could do the following:
.ds str1 bar
.
.nr nr1 5
.ds str1-foo \"
.ds str1-bar \"
.ds str1-baz \"
.
.if d str1-\*[str1] \
. if (\n[nr1] == 5 ) \
. tm okay
Werner
